A 2-d shape is 2-dimensional. It has length and width but no height.
In real life: pictures and screen images are 2-d images. Printed shapes on paper are [nearly] 2d. I added nearly, in case there is pedant out there who points out that an image printed on a page has the thickness of the ink!
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what are the 2d shapes of the real world
the cylinder has 2 2d shapes: the 2 circles on the end
Polygons are 2d shapes whereas polyhedrons are 3d shapes
2d shapes only have length and width, while 3d shapes have length, width and depth.
Because you only need two dimensions to describe it; length and width.